/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package com.google.code.twiddling.core.context;

import java.util.HashMap;
import java.util.Map;

import com.google.code.twiddling.core.bootstrap.TwiddlingShell;

/**
 * @author <a href="mailto:jeff.yuchang@gmail.com">Jeff Yu</a>
 *
 */
public class DefaultEnvironment implements Environment {
	
	private Profile profile;
	
	private Map<String, String> variables;
	
	private TwiddlingShell shell;
	
	public DefaultEnvironment() {
		this(null);
	}
	
	public DefaultEnvironment(TwiddlingShell shell) {
		this.profile = new DefaultProfile();
		this.variables = new HashMap<String, String>();
		this.shell = shell;
	}

	
	public void activate() {	
		//currently none.
	}

	
	public void deactivate() {
		this.profile = null;
		this.variables.clear();
		this.variables = null;
	}

	
	public Profile getProfile() {
		return this.profile;
	}

	public String getVariable(String name) {
		return variables.get(name);
	}

	
	public void setProfile(Profile profile) {
		this.profile = profile;
	}

	
	public void setVariable(String name, String value) {
		this.variables.put(name, value);
	}


	public void removeVariable(String name) {
		this.variables.remove(name);
	}

    protected String[] keys() {
        return variables.keySet().toArray(new String[variables.size()]);
    }


	public TwiddlingShell getShell() {
		return shell;
	}

}
